By means of GIS method, the digital elevation model(DEM)is established, the subcatchment boundaries are studied.

利用 GIS 方法建立了数字高程模型（DEM），研究了子汇水面积的边界。

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For example, Digital Elevation Model (DEM) data points are equally arranged in a grid pattern.

例如，数字高程模型(Digital Elevation Model, DEM)数据点在网格图形中均匀排列。

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Digital elevation model (DEM) is the fundamental infrastructure of geographical information systems and has wide applications in both military and civil areas.

数字高程模型(dem)是重要的基础地理信息数据，在军事和民用领域有着重要的应用价值。

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This digital elevation model (DEM) will support a multitude of applications, such as the programming of navigation computers in military jets to enable them to fly ultra low.

BBC: German TanDEM-X satellite returns first images

This digital elevation model (DEM) will be put to myriad uses - everything from improving the safety of aircraft navigation to understanding better which areas of ground are most at risk during a flood.

BBC: German radar satellites fly tight space waltz